Oxidation of β-Zr and related phases in Zr-Nb alloys:: an electron microscopy investigation

被引：35
|
作者：
Lin, YP
Woo, OT
机构：
[1] Ontario Power Technol, Toronto, ON M8Z 6C4, Canada
[2] Atom Energy Canada Ltd, Chalk River Nucl Labs, Chalk River, ON K0J 1J0, Canada
来源：
JOURNAL OF NUCLEAR MATERIALS | 2000年 / 277卷 / 01期
关键词：
D O I：
10.1016/S0022-3115(99)00153-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The oxidation of the metastable beta-Zr phase in Zr-Nb alloys, primarily Zr-2.5Nb, in 673 K steam or in lithiated water at 583 K, was investigated using electron microscopy and microanalyses. In the SEM, oxidised beta-Zr regions in the Zr-2.5Nb alloy were imaged via a field effect contrast mechanism. In the TEM, microanalyses consistently showed the presence of Nb associated with the oxidised beta-regions in suitably prepared samples. The beta-Zr was found to form a Nb2Zrx-2O2x+1 oxide, while the beta-Nb exhibited delayed oxidation with respect to alpha-Zr, forming a metallic sub-oxide initially and becoming amorphous when oxidised. For the partially decomposed beta-Zr, the omega-phase was found to form monoclinic ZrO2, while the Nb-enriched beta-Zr followed the behaviour of either beta-Zr or beta-Nb depending on the Nb concentration. (C) 2000 Elsevier Science B.V. All rights reserved.
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页码：11 / 27
页数：17
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